<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>TEST</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js">
	
</script>
<style type="text/css">
    form{width:600px;min-height:200px;margin:50px auto;padding:20px;border:1px solid #ccc;}
    #queryinput div{padding:5px 0;}
</style>
<script>
    $(function(){
        $("input[name='add']").click(function(event) {
            $("#queryinput").append($("#queryinput div:first-child").clone(true));
        });
        $("input[name='del']").click(function(event) {
            $(this).parent().remove();
        });
    })
</script>
</head>
<body>
<form>
    <input type="button" name="add" value="添加查询栏位" />
    <div id="queryinput">
        <div>
            <select>
                <option>aitem1</option>
                <option>bitem2</option>
                <option>bitem3</option>
                <option>ditem4</option>
                <option>eitem5</option>
            </select>
            <input type="text">
            <input type="button" name="del" value="删除" />
        </div>
        
    </div>
</form>
</body>
</html>